I wrote to Wargaming.net a couple of days ago with a request to have some (if not all) GPG forum content released to the community, particularly forums like Mod Developer Support, which had a lot of reference material. I know I wasn't the only feeling the loss the forums and the general assumption was that they were closed for good. This is the reply I got...
Hello *****,
This eventually made it to the right person. We have been reconfiguring our network to meet the new Wargaming standards, so unfortunately the forums were adversely affected. We plan to have them back up and functioning by next week. Thank you for being understanding during our transition.